The Government has confirmed outbreaks of koi herpesvirus (KHV) disease in fish at sites in the UK. KHV is a serious viral disease that affects common and ornamental carp species, and is often fatal. Disease controls are currently in place at sites in Norfolk and Lancashire.
Fish affected can show the following signs, according to gov.uk, especially when water temperatures are between 16 and 28°C:
necrotic (white or brown) patches on the gills
rough patches on the skin and sloughing mucous
sunken eyes
